Better error message for checking if the UUID of the dependencies is in the registry

[SebastianM-C]

Credit to @ericphanson

Rewrite dependency uuid check so that it gives a better error message when an UUID in depuuids is not in alluuids.

[DilumAluthge]

Thanks @SebastianM-C!

I've merged #362, which is a tweaked version of this PR. I think that solves the issue - let me know if there are any remaining issues.

[SebastianM-C]

Thanks for the quick reply!
One possible enhancement would be to use a more general error message such that it accommodates the case where RegistryCI.jl is used in a custom registry (for example by mentioning the names or urls of the registries involved).

[DilumAluthge]

Hmm, well in that case, you know what the external registries are, right? You passed them in the registry_deps argument.

[SebastianM-C]

Yeah, right. 🤔
I have a question regarding that usage. In a custom registry should the General registry be included in registry_deps if there are packages with dependencies in there?

[DilumAluthge]

Yeah that's exactly what the registry_deps keyword argument is supposed to do.

I think you've found a bug. Bug fix here: #367